My newly acquired 1991 Explorer has the wipers stuck in the up position on the windshield. I can hear clicking in the steering column when I put on the wipers but there is no movement on the windshield wipers. Is this a multi-function switch problem, a motor problem or a ground problem?? I have looked at some of the other threads and seems to be the ground from the battery to the motor. Where is the ground located??? Thanks!!!